ukvm-configure: Correct dependencies in generated Makefile
ukvm-configure: Correct dependencies in generated Makefile

1. Make _build_ukvm/ an order-only prerequisite, thus not rebuilding
bits of ukvm every time due to the timestamp on the directory changing.

2. Add $(MAKEFILE_LIST) to ukvm dependencies, forcing a rebuild of ukvm
if the generated Makefile has changed (e.g. from re-running of
ukvm-configure).

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